The major function of the respiratory system is to: A. give the heart the energy it needs to circulate blood. B. cleanse the body of toxins, poisons, and harmful chemicals. C. maintain the digestive system

The major function of the respiratory system is to:

A. give the heart the energy it needs to circulate blood.
B. cleanse the body of toxins, poisons, and harmful chemicals.
C. maintain the digestive system of the body so that it can continue to operate.
D. provide oxygen to the body and eliminate carbon dioxide from the body.

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